clk: imx: drop duplicated macro

Drop duplicated macro definition

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Link: https://lore.kernel.org/r/20230403082728.3199849-1-peng.fan@oss.nxp.com